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Preheat oven to 375 degrees F (190 degrees C).
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Place chicken breasts in a lightly greased 9x13 inch baking dish.
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Sprinkle taco seasoning on both sides of chicken breasts, and pour salsa over all.
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Bake at 375 degrees F (190 degrees C) for 25 to 35 minutes, or until chicken is tender and juicy and its juices run clear.
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Sprinkle chicken evenly with cheese, and continue baking for an additional 3 to 5 minutes, or until cheese is melted and bubbly.
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Top with sour cream if desired, and serve.